If you would like to confirm that you have received a letter about bullying, here is a sample template you can used to write a letter acknowledging a bullying complaint.
To [Recipient name]
Dear, [Recipient name]
This letter is to acknowledge that we have received your letter regarding a bullying complaint against [Name]. We assure you that this will not be tolerated under any circumstances.
We are investigating your complaint and we will hold a meeting with both parties on [Date] at [Time] in the presence of higher authorities. This meeting will allow the involved persons to present their cases and a punishment will be decided accordingly.
We regret that you have had to undergo such harassment and we will take sufficient measures to rectify it.
[Name of company]